Add libmangle minimalist "mainpage"

git-svn-id: svn+ssh://svn.code.sf.net/p/mingw-w64/code/trunk@1471 4407c894-4637-0410-b4f5-ada5f102cad1
diff --git a/mingw-w64-libraries/libmangle/src/mainpage.h b/mingw-w64-libraries/libmangle/src/mainpage.h
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+// This is the mainpage file for doxygen
+// See <http://www.doxygen.nl/commands.html>
+// for command help.
+
+/*! \mainpage Libmange
+  \author The mingw-w64 Dev Team
+  \version 1.0
+  \section intro_sec Introduction
+ 
+  Libmangle is library for translating C++ symbols produced by Microsoft Visual Studio C++ suite of tools into human readable names.
+  \subsection info_subsec Name Mangling
+  Name mangling is a technique used by modern compilers to add addition information about a function, a structure or a datatype to a symbol name. Information can include call parameter type and return type, symbol namespace and etc. Often, the way the information is encoded in specific to a compiler vendor.
+  \subsection cpp_subsec C++ and Name Mangling
+  Languages such as the C++ language do not define a standard name decoration scheme, most often code produced by one compiler is also incompatible with another C++ compiler ABI wise. Name mangling prevents accidentally linking to code meant for another compiler.
+  \subsection decde_subsec Deciphering Mangled Names
+  Libmangle allows symbol names on objects created by Microsoft Visual C++ tools to be decoded into human readable names. In addition to easing debugging, it also allows the possibility of non-MSVC tools to examine the objects.
+  \subsection external_subsec External Links
+  For more information, see: http://en.wikipedia.org/wiki/Name_mangling
+  \section install_sec Installation
+   
+  Use the shell script "configure" and pass "--help" for library build and install options.
+ */